Methods and apparatus for swept-source optical coherence...

Optical: systems and elements – Optical amplifier – Particular active medium

Reexamination Certificate

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C372S018000, C372S020000

Reexamination Certificate

active

07916387

ABSTRACT:
In one embodiment of the invention, a semiconductor optical amplifier (SOA) in a laser ring is chosen to provide low polarization-dependent gain (PDG) and a booster semiconductor optical amplifier, outside of the ring, is chosen to provide high polarization-dependent gain. The use of a semiconductor optical amplifier with low polarization-dependent gain nearly eliminates variations in the polarization state of the light at the output of the laser, but does not eliminate the intra-sweep variations in the polarization state at the output of the laser, which can degrade the performance of the SS-OCT system.

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